Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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Which factor is NOT considered when determining the characteristics of air compressor oils?

Viscosity
Flash point
Dew point
Pour point

The correct answer is: Dew point

The characteristics of air compressor oils are critical to ensuring optimal performance and reliability of the equipment. Viscosity, flash point, and pour point are all essential properties that help determine the oil's suitability for use in compressors. Viscosity is crucial as it affects the oil’s ability to flow and lubricate the components of the compressor effectively. A proper viscosity rating ensures that the oil can create a sufficient film to prevent wear and tear. The flash point indicates the temperature at which the oil can vaporize to form an ignitable mixture in air. This property is important in preventing fire hazards and ensuring safety during operation. The pour point is the lowest temperature at which the oil remains fluid and can flow. Oils must not solidify in low temperatures to maintain proper lubrication. In contrast, the dew point is a measure related to humidity and the temperature at which air becomes saturated with water vapor, leading to condensation. While it is a significant factor in understanding air composition and moisture control, it does not directly relate to the characteristics of the oils used in compressors. Thus, it is not considered when determining the characteristics of air compressor oils.